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Nailor Model 0722 Ceiling Dampers are for use in round applications, in lieu of hinged door type dampers in any UL/ULC floor/ceiling or roof/ceiling assembly with up to a 3 hour fire resistance rating where air ducts are allowed. Exteneded collar models 0722-SE and 0722-LE available. Adjustable models 0722A, 0722A-SE, and 0722A-LE available.